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3 - <br /> WASTE DISCHARGE REQUIREMENTS <br /> CITY OF STOCKTON MAIN WATER QUALITY <br /> CONTROL PLANT, SAN JOAQUIN COUNTY <br /> 30-day 7-day 30-day Daily <br /> Constituent Units Average Average Median Mciximum <br /> c. Settleable Matter ml/1 - - - - - - 0.1 <br /> d. Chlorine Residual mg/l - - - - - - '(12 <br /> e. Total Coliform(2) WN/100 ml - - - - 23 500 <br /> Organisms <br /> f. Grease 6 Oil mg/l 10 - - - - 15 <br /> lbs/day 4,835 - - - - 8,380 <br /> kg/day 2,200 - - - - 3,800 <br /> g. Flow MGD 58 61 _ _ 67 <br /> 1/sec 2,540 2,627 2,935 <br /> (1) 5-day, 20uC Biochemical Oxygen Demand <br /> _ (2) Limits can be met at any point in the treatment system <br /> 2. During the period 1 August through 31 October the discharge of an effluent <br /> in excess of the limits contained in A.1 above is prohibited excepting: <br /> 30-day 7-day Daily <br /> Constituent Units Average Average Maximum <br /> a. BOD mg/l 10 20 30 <br /> lbs/day 4,840 10,180 16,770 <br /> kg/day 2,200 4,600 7,600 <br /> b. Total Suspended mg/l 10 20 30 <br /> Matter lbs/day 4,840 10,180 16,770 <br /> kg/day 2, 200 4,600 7,600 <br /> 3. The arithmetic mean biochemical oxygen demand (5-day) and suspended <br /> solids in effluent samples collected in a period of 30 consecutive days <br /> shall not exceed 15 percent of the arithmetic mean of the values for <br /> influent samples collected at approximately the same times during the <br /> same period (85 percent removal) . <br /> 4. The discharge shall not have a pH less than 6.0 nor greater than 8.5 <br /> nor. shall it cause a change greater than 0.5 in the pH of the receiving <br /> waters. <br /> 5. Bypass or overflow of untreated or partially treated wastes is prohibited. <br /> 6. The discharger shall use the best practicalbe cost effective control <br /> technique currently available to limit mineralization to no more than <br /> a reasonable increment. <br />